A tire valve cap from Kics Racing Gear for the ALL YEARS Mazda Miata. The Kics N2 Gas Valve Caps are an easy way to alert service technicians that nitrogen, not air is used to inflate your tires. Nitrogen has become popular in recent years since it does not expand and contract with fluctuations in temperature. The Kics Racing Gear N2 Valve Stem Caps feature a warning icon on top and are offered in a number of colors; red, black, blue, silver, and silver plating are all available. Kics offers these valve caps in sets of four. Project KICS N2 Gas Valve Caps should be ordered at REV9 Autosport https://rev9autosport.com/kics-racing-gear-n2-gas-valve-caps.html as they provide the best service and speed we've seen so far!